In so many ways, and for so many reasons.
What's clear about Justice League is how hard DC and WB are trying to compensate for what's come before, not only in the tonal shift, but in the problematic story-telling and character development that has so plagued the DCEU.
BvS's Batman was an unhinged killer, so they make repeated reference to him being old, jaded and crazy.
And he makes jokes.
Superman has been conflicted, dour and boring, so now, having died and been resurrected, he's lightened up.
And he makes jokes.
They even shoe-horn in an excuse for why Wonder Woman dropped off the map for a century, in one of the film's many exposition dumps.
And she makes jokes.
By the way, SPOILER ALERT: Superman's not dead.
...gasp.
Well, he was (despite the end of BvS clearly showing he wasn't), but the other heroes come up with a convoluted way to bring him back (or wake him up) using the film's MacGuffin...just so the bad guy could come in and nick it to set up the third act.
The bad guy, incidentally, is...just the bad guy. Never heard of him, and no idea what his back story is. He's basically a CGI-rendered Ronan the Accuser with less depth.
As for the rest of the cast, given the amount they have to do with such limited screen time, they're actually rather good.
In fact, Ezra Miller is great as Barry Allen/The Flash: genuinely funny and charming; and I will give the film credit that it manages to strike a good balance between making him a lot more powerful than The Avengers' Quicksilver, yet restricted enough by his own neuroses and inexperience to avoid being as OP as X-Men's Quicksilver. He's also afforded the most organic back-story and character development of the new-comers (though that's not saying much).
Jason Momoa has acres of screen-presence as Aquaman, but his development is no more interesting than, "I'm a loner and don't work with others... Okay, now I work with others" and his back-story is nothing more than a brief conversation between him and some random Atlantian woman who's supposed to be Mera - his wife from the comics - but is here given no name and only two lines of dialogue (one of which weirdly suggests they may be brother and sister).
Finally, Ray Fisher does a decent job with Cyborg's internal conflict, but his "arc" is as abrupt as Aquaman's, and as convincing as the CGI used to render him. I.e. not.
Side note: remember early in the third act of the Avengers, when the
heroes all gather for the first time in one awesome hero-shot?
This thing tries to do the same, FIVE TIMES!
And not one of those times works.
The story is all over the place: The world is apparently sad, and has gone to shit because Superman's died, despite the world in BvS being deeply divided over whether or not his presence was a good thing. Everyone harps on about him being a symbol of hope, which doesn't remotely gel with the attitudes of his previous two outings.
There are also weird time and location skips, suggesting WB were far more concerned with getting it under two hours than with story flow.
For example, the climax of one battle has the heroes clinging to a thing while water rushes up, threatening to drown them. The scene then immediately cuts to them all standing on dry land talking about what they're going to do next, as if the editor just had a stroke.
In the first act, every scene shifts without natural transition, as if they're all isolated shorts clipped together at random: now we're in Gotham; now we're in Themyscira; now London; now Iceland; now Russia...maybe...?
Even the score is messy. Gone are the Hans Zimmer BHWAAAARMMMs, here replaced with uplifting strings that sound a little too close to The Avengers' soundtrack. The Wonder Woman theme makes a brief reappearance, as does a bar or two from Tim Burton's Batman films (not too surprising given they brought Danny Elfman on to do the score).
The thing is, with all that said, it's actually not terrible. It's not good, but it is watchable, sporadically entertaining and a damn sight better than three of the four films that have preceded it. Afleck's still good as Batman (in fact, better here than he was in BvS (at least he now has a personality)), Gadot's still awesome as Diana, Jeremy Irons is still an interesting Alfred, and Cavil is still...well, he looks the part.
The characters and set-pieces are mostly entertaining, the script's mostly snappy, and it mostly isn't boring. I realise that's hardly a ringing endorsement, but what's most clear about this film is that it's damage control. Man of Steel was underwhelming, Batman v Superman was crap, and Suicide Squad was only marginally better on account of taking itself slightly less seriously. Unlike The Avengers, which was Marvel's self-congratulatory fireworks display to cap-off phase one, Justice League is a desperate attempt to end on a positive note. They know they're not going to impress anyone, so they just want to round things off in a not-awful fashion, in the hope attitudes are a little more positive when (if) they finally start their phase two.
